HoDoKu Solving Technique Index: Example for "Unique Rectangle Type 4"

Solving Technique Example

Original sudoku:

...76..9...6.3.4.1....8..3.............47...22351...4.493.26...82......3.........

Use the following line if you want to load the sudoku in HoDoKu:

:0603:7:+3..76..9+8.+86.3+54.1....8..3....+6+5+2+3.+9...47+3..22351+9+8.4.493+826...82+1+5+4+7+9+63..+7+3+1+9..+4:748 657 597 598:737 739:

The following representation can be pasted in most Sudoku programs:

.-----------------.-----------.----------------.

| 3     145   24  | 7   6  14 | 25    9    8   |

| 79    8     6   | 29  3  5  | 4     27   1   |

| 1579  1457  249 | 29  8  14 | 2567  3    567 |

:-----------------+-----------+----------------:

| 17    147   48  | 6   5  2  | 3     18   9   |

| 169   16    89  | 4   7  3  | 158   158  2   |

| 2     3     5   | 1   9  8  | 67    4    67  |

:-----------------+-----------+----------------:

| 4     9     3   | 8   2  6  | 157   157  57  |

| 8     2     1   | 5   4  7  | 9     6    3   |

| 56    56    7   | 3   1  9  | 28    28   4   |

'-----------------'-----------'----------------'

Representation of the step:

.-----------------.-----------.--------------------.

| 3     145   24  | 7   6  14 |  25     9     8    |

| 79    8     6   | 29  3  5  |  4      27    1    |

| 1579  1457  249 | 29  8  14 | *256-7  3    *56-7 |

:-----------------+-----------+--------------------:

| 17    147   48  | 6   5  2  |  3      18    9    |

| 169   16    89  | 4   7  3  |  158    158   2    |

| 2     3     5   | 1   9  8  | *67     4    *67   |

:-----------------+-----------+--------------------:

| 4     9     3   | 8   2  6  |  157    157   57   |

| 8     2     1   | 5   4  7  |  9      6     3    |

| 56    56    7   | 3   1  9  |  28     28    4    |

'-----------------'-----------'--------------------'



Uniqueness Test 4: 6/7 in r3c79,r6c79 => r3c79<>7